The Spyder men's core sweater has a soft backing, so you get the warmth of a polyester knit sweater combined with fuzzy fleece. Layer the core sweater under your ski shell without the bulk, and the front zipper lets you regulate your temperature as the day heats up. Stretch fleece side panels give you the freedom to move as you glide over cross country trails, and the Core sweater has a brushed inner collar that will not rub against your chin when you have this Spyder top zipped all the way up.